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Equity (Tables)
6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Summary of Stock Option Activity

A summary of stock option activity for the six months ended June 30, 2019 is as follows:

 

  

Number

of Options

(in shares)

  

Weighted

Average

Exercise

Price Per Share

   Weighted
Average
Remaining
Contractual Life
   Aggregate
Intrinsic Value
 
Outstanding at December 31, 2018   

1,466,489

   $3.01     1.88 years   $13 
Granted   227,500    0.31           
Exercised                   
Forfeited or expired   (104,834)   7.33           
Outstanding at June 30, 2019   1,589,155   $2.34    2.2 years   $21 
Exercisable at June 30, 2019   1,333,155   $2.73    1.4 years   $21
Schedule of Stock Options Fair Value Assumptions Estimated Using Black-Scholes Pricing Model

The fair value of the options granted of $52 was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions:

 

Risk-free interest rate   2.3%
Expected term of options   4.7 years 
Expected annual volatility   119%
Expected dividend yield   %
Summary of Warrant Activity

The Company previously issued warrants at exercise prices equal to or greater than market value of the Company’s common stock at the date of issuance. A summary of warrant activity follows:

 

  

Number

of Warrants

(in shares)

   Weighted
Average
Exercise
Price Per Share
   Weighted
Average
Remaining
Contractual Life
 
Outstanding at December 31, 2018   2,392,142   $1.28    1.34 years  
Granted             
Exercised             
Forfeited or expired             
Outstanding at June 30, 2019   2,392,142   $1.28    .85 years